With today's tussles over immigration and wages, BBC political correspondent Ben Wright says both sides of the campaign know the referendum result could hinge on lower-paid workers - many of them traditional Labour voters.

"The battle for this slice of the electorate could be crucial," he adds.

The TUC, which backs a Remain vote, is warning average earnings in Britain would be lower by 2030 outside the EU - adjusting wages for smaller GDP growth.

A study by the organisation also says employee rights and manufacturing jobs in particular would be hit.

TUC general secretary Frances O'Grady said: "At a time of continuing hardship, Brexit would be a disaster for working people - for our wages, for our jobs and for our rights.

"£38 a week may not be much for politicians like Boris Johnson, but for millions of workers, it's the difference between heating or eating, between struggling or saving, and between getting by or getting on."

Britain Stronger In Europe, the official Remain campaign group, has attacked Vote Leave's immigration proposal, saying it "will not work".

Executive director Will Straw said: "Vote Leave's proposal could put up immigration and it would wreck our economy, as it involves leaving Europe's single market."

He added: "Australia, who have a points-based immigration system, have twice as many migrants per head as the UK."

Britons living abroad are being urged by the Electoral Commission to register to vote in the UK's EU referendum before the 7 June midnight deadline.

Some expats have told the BBC there has been confusion over the registration cut off, which some thought was 16 May.

This was only an advisory date to make sure people had time to get and return a postal vote, the commission said.

Overseas voters must have been on the UK electoral register in the last 15 years to be eligible.

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Vote Leave are setting out their vision of a post-EU immigration today.

A statement from Boris Johnson, Michael Gove, Priti Patel, and Gisela Stuart has set out the blueprint for a system which would end the automatic right of EU citizens to come to live and work in the UK.

Instead, the right to come to the UK would be based on skills. A similar system currently operates for people from outside the EU who want to come to the UK.

The proposed system would not apply to Irish citizens or for EU citizens who are already lawfully resident in the UK.

Ahead of the EU referendum on 23 June, journalist Allan Little looks at the relationship Scotland has with Europe and the possible implications north of the border if the UK ends its membership.

Ahead of the UK's referendum, the BBC's Rob Watson explores Britain's very tricky history with our European neighbours.

Where is the sense of history in the debate surrounding the EU referendum, asks Gavin Hewitt.

Sarah Smith visits a British fishing port to see why the UK fishing industry is fighting to leave the EU.

Here's your Tuesday round-up of the big EU referendum stories:

• Leading Leave campaign figures say they want to be able to scrap VAT on fuel to help the poorest households
• Leaving the EU would be bad for small businesses, Remain-backing minister Sajid Javid has said
• Sadiq Khan has defended campaigning with David Cameron in the EU referendum, saying he wants to make it clear Labour supports a Remain vote
• Shadow chancellor John McDonnell said sharing a platform with Conservatives "discredits" Labour but did not mention Mr Khan by name
• UKIP leader Nigel Farage was heckled during a largely well-received visit to Birmingham but cancelled a visit to Northampton after protests

Newsnight

Conservative MP and Leave campaigner Chris Grayling tells the BBC's Newsnight that the European Union is consulting on the "social pillar" - the European Pillar of Social Rights., external

This, he says, is the "next stage" of integration for the eurozone. While the measures would be voluntary for non-eurozone states, the UK has "no opt-out from European social legislation", Mr Grayling claims, and "there is no mechanism for them not applying to us".

Labour MP and Remain campaigner Emma Reynolds says this is a "false premise" as the UK has "a long history" of opt-outs, for example from the eurozone's banking union and the Schengen passport-free area.

She claims that "the economic risks of leaving are so huge" that the Leave campaign is trying "a distraction technique".

After the economic bludgeoning of the Vote Leave campaign by Remain, it's clear that Outers were keeping something in the cupboard for this moment.

Shadow chancellor John McDonnell tells the BBC his argument that sharing a platform with Conservatives "discredits" Labour was not aimed at the London mayor.

The BBC is hearing from a range of voters about the EU referendum issues that will help them decide how to vote on 23 June.

BBC political editor Laura Kuenssberg says Leave campaigners will set out "how they actually want to control immigration"  tomorrow.

They will propose "a very big change for the country", Laura says, ending the automatic right for EU citizens to come to the UK and applying a "points-based system" - based on qualifications and skills that employers need - to people "from every country in the world".

She adds that Conservative MPs and Leave campaigners Boris Johnson and Michael Gove seem to be "announcing policies for a hypothetical post-Brexit government" - which, of course, does not exist yet.